AA 3977 then AA 2805 at O'Hare
Detroit → Chicago → Indianapolis
Timetable, Chicago time
14:05AA 3977 from Detroit at the gate
22:30AA 2805 to Indianapolis leaves the gate
8 h 25 apart on the timetable
The last days
AA 3977 and AA 2805 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.